From 30ceb4e6e31b5aa4b204b5261e1a325f02cf03ce Mon Sep 17 00:00:00 2001 From: josharsh <500060668@stu.upes.ac.in> Date: Sat, 17 Aug 2019 13:36:24 +0530 Subject: [PATCH] middlewares in express --- README.md | 6 + part_5_express_middlewares/README.md | 44 ++ part_5_express_middlewares/app.js | 39 ++ part_5_express_middlewares/package-lock.json | 399 +++++++++++++++++++ part_5_express_middlewares/package.json | 15 + 5 files changed, 503 insertions(+) create mode 100644 part_5_express_middlewares/README.md create mode 100644 part_5_express_middlewares/app.js create mode 100644 part_5_express_middlewares/package-lock.json create mode 100644 part_5_express_middlewares/package.json diff --git a/README.md b/README.md index 181dbcb..fb448d8 100644 --- a/README.md +++ b/README.md @@ -25,3 +25,9 @@ A very simple Web API, using JSON data from a file. We have divided the process - In this part, We have implemented basic routing using Express.js . - To Learn more about how to implement Routing in Node using Express.js, you may refer this article. + +## 🚀 Part 5 + +- In this part, We have included middlewares in our Express app. + +- To Learn more about middlewares in Express.js, you may refer this article. diff --git a/part_5_express_middlewares/README.md b/part_5_express_middlewares/README.md new file mode 100644 index 0000000..55c77e1 --- /dev/null +++ b/part_5_express_middlewares/README.md @@ -0,0 +1,44 @@ +# web_api_nodejs + +# Part 5: Middlewares in Express.js + +## ⭐ What is a Middleware ? + +Middlewares are functions that are executed in between i.e in the middle of receiving a request and sending back a response. They are used to manipulate request or response object or to execute any other code. + +Middleware functions can perform the following tasks: + +- Execute any code. +- Make changes to the request and the response objects. +- End the request-response cycle. +- Call the next middleware function in the stack. + +In this part, we have included some middlewares in our Express app. + +To understand more about creating the web server, you may refer part 1. + +To understand more about implementation of Routes in Node, you may refer part 2. + +To understand more about creating a Web Api in Node, you may refer part 3. + +To understand more about implementing routing in Express.js , you may refer part 4. + +## 🚀 Get Started + +1. Clone or download the repository. + +2. Once you've downloaded the repo, Open it in an editor of your choice. + +3. Open the terminal and traverse to **part_5_express_middleware** directory. + +4. Now run command `npm install` to install all the required dependencies. + +5. Now run command `node app.js` to start the server. + +6. Open Postman and go to `127.0.0.1:3000` to see your server running. + +7. Go to `GET 127.0.0.1:3000`, `POST 127.0.0.1:3000/data`, `GET 127.0.0.1:3000/some-random-route` to test the working of the middlewares. + +## 📝 Learn More + +To Learn more about how to include middlewares in Express.js, you may refer this article. diff --git a/part_5_express_middlewares/app.js b/part_5_express_middlewares/app.js new file mode 100644 index 0000000..f3542ea --- /dev/null +++ b/part_5_express_middlewares/app.js @@ -0,0 +1,39 @@ +// Require express + +const express = require("express"); +const app = express(); +const morgan = require("morgan"); + +app.use(express.json()); +app.use(morgan("dev")); + +// Middleware +app.use((req, res, next) => { + console.log("Hello from the middleware !"); + next(); +}); + +// Listening to server +const port = 3000; +app.listen(3000, () => { + console.log(`App running on port ${port}`); +}); + +// Routes + +app.get("/", (req, res) => + res + .status(200) + .json({ message: "Hello from the server !", app: "Express-Routes" }) +); + +// Middleware +app.use((req, res, next) => { + console.log("Hello from the middleware defined after the route !"); + next(); +}); + +app.post("/data", (req, res) => { + console.log(req.body); + res.status(200).json({ status: "Success !", data: { body: req.body } }); +}); diff --git a/part_5_express_middlewares/package-lock.json b/part_5_express_middlewares/package-lock.json new file mode 100644 index 0000000..0b79141 --- /dev/null +++ b/part_5_express_middlewares/package-lock.json @@ -0,0 +1,399 @@ +{ + "name": "express-routing", + "version": "1.0.0", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "accepts": { + "version": "1.3.7", + "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz", + "integrity": "sha512-Il80Qs2WjYlJIBNzNkK6KYqlVMTbZLXgHx2oT0pU/fjRHyEp+PEfEPY0R3WCwAGVOtauxh1hOxNgIf5bv7dQpA==", + "requires": { + "mime-types": "~2.1.24", + "negotiator": "0.6.2" + } + }, + "array-flatten": { + "version": "1.1.1", + "resolved": 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"author": "Priyanka Yadav", + "license": "ISC", + "dependencies": { + "express": "^4.17.1", + "morgan": "^1.9.1" + } +}